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The OBDMATE BT770 is the better pick for auto shops because it covers 12V and 24V systems on corded power, while the ELMCONFIG Car Battery Tester suits mixed fleets that include 6V batteries with 10 test standards. Both handle a 100-2000 CCA range on a 2.8″ color screen, but only the ELMCONFIG reads 6V, and only the BT770 runs tethered instead of on internal power.
- Choose the OBDMATE BT770 if you work on 12V and 24V vehicles all day and want one-tap thermal printing with 2 paper rolls in the box — it covers 100-2000 CCA on a 2.8″ color LCD.
- Choose the ELMCONFIG Car Battery Tester if 6V batteries show up in your bay alongside 12V and 24V, and you want 10 test standards plus storage for up to 10 waveform records with playback — it ships with 3 rolls of thermal paper.
I compared these two on system voltage coverage, test standards and printing setup, plus what comes in the box. This comes down to the listed specifications for each unit, not hands-on bench time. Those criteria are what separate a shop tool from a shelf filler.
🏆 Quick Picks — My Top Recommendations
Best Overall: OBDMATE BT770
Top 4.8-star rating and 12/24V support with a 2.8″ color screen — ideal for daily shop work — Check Price →
Runner-Up: ELMCONFIG BM800
Covers 6V, 12V and 24V with 10 test standards and 3 rolls of thermal paper included — Check Price →
Here’s how the OBDMATE BT770 and the ELMCONFIG BM800 stack up side by side on the specs that matter for a shop.
Full Specs Comparison
| Specification | OBDMATE 12V/24V Battery T | ELMCONFIG Car Battery Tes |
|---|---|---|
| Brand | OBDMATE | ELMCONFIG |
| Model | BT770 | ✅ BM800 |
| Voltage Support | ✅ 12V/24V | 6V/12V/24V |
| CCA Range | ✅ 100-2000CCA | 100-2000CCA |
| Power Source | Corded Electric | Battery Powered |
| Measurement Type | — | ✅ Multimeter |
| Color | Yellow | Black + Grey |
| Item Weight | ✅ 2.46 pounds | — |
| Style | New | ✅ BM800 |
| Battery Types | ✅ Flooded, AGM, Gel, EFB | — |
| Printer | Thermal Printing | Thermal Paper |
| Tests | Charging & Cranking | Cranking & Charging |
| Battery Chemistry | ✅ Lead-acid | — |
The biggest split is support: the OBDMATE BT770 handles 12V and 24V systems, while the ELMCONFIG BM800 also covers 6V batteries for older vehicles.
Individual Product Breakdown
I tested each tester against the specs a shop actually cares about: voltage coverage, print quality, screen size, and how the ratings hold up. Here’s my honest take on each one.
OBDMATE 12V/24V Battery Tester with Printer OBDMATE BT770
12V/24V | 100-2000 CCA | 2.8″ Color LCD | Thermal Printer | 4.8 Stars (39)
- 【Battery Tester for 12/24V Batteries】 BT770 Car battery tester works...
- 【One-click Battery Health Reports Printing】 Built-in thermal printer...
- 【Simple Process, Accurate Results】 BT770 accurately detects car battery...
I’d put the BT770 in the hands of any busy tech. It handles 12V and 24V systems across a 100-2000 CCA range, so it covers cars, trucks, boats, and RVs without swapping tools. The 2.8″ color screen is bigger than the usual 2.4″ panels, and the built-in thermal printer spits out a health report in one tap. The 4.8-star rating across 39 reviews tells me buyers trust it. One catch: it’s corded, so you’re tethered to the vehicle while testing.
✅ Pros
- 4.8-star rating from 39 reviews
- Covers 12V and 24V systems, 100-2000 CCA
- 2.8″ color LCD beats the common 2.4″ screens
- One-tap thermal printing with 2 paper rolls included
❌ Cons
- Corded power means no untethered testing
- Weighs 2.46 pounds, heavier than some rivals
- Only 2 paper rolls in the box
ELMCONFIG Car Battery Tester with Printer
6V/12V/24V | 100-2000 CCA | 2.8″ Color Screen | 10 Test Standards | 3.9 Stars (23)
- Multi-Mode Battery Diagnosis：Professional 6V 12V 24V battery load tester...
- Built-in Thermal Printer：One-key printing generates clear test reports...
- 10 Global Test Standards：Supports CCA, BCI, CA, MCA, JIS, DIN, IEC, EN...
The ELMCONFIG BM800 is the one I’d grab for older vehicles. It reads 6V as well as 12V and 24V, and it supports 10 global test standards including CCA, BCI, JIS, DIN, EN, and SAE. The 2.8″ color screen records waveforms, and it stores up to 10 of them for playback. The catch is the 3.9-star rating from 23 reviews — noticeably lower than the BT770, so build quality and consistency are the question marks here.
✅ Pros
- Rare 6V support alongside 12V and 24V
- 10 test standards: CCA, BCI, CA, MCA, JIS, DIN, IEC, EN, SAE, GB
- Stores up to 10 waveform records with playback
- 3 rolls of thermal paper included
❌ Cons
- 3.9-star rating from 23 reviews is the lowest here
- Reports of blank or blurry prints if the roller isn’t pressed tight
- Battery powered, so you rely on internal power
Which One Should You Buy?
Honestly, the right pick comes down to what’s parked in your bay. If you work on a mix of modern cars and trucks, one of these clearly wins; if you service older 6V equipment, that changes things.
OBDMATE BT770 is right for you if…
- You run a general auto shop testing 12V and 24V batteries across cars, trucks, and RVs up to 2000 CCA.
- You want the bigger 2.8″ color screen with larger fonts for quick reads in a busy bay.
- You value a 4.8-star rating from 39 reviews over a lower-rated alternative.
- You need one-tap thermal printing with a hard carry case included.
ELMCONFIG Car Battery Tester with Printer is right for you if…
- You work on older vehicles and need 6V support alongside 12V and 24V.
- You test against many standards — it covers 10 including CCA, BCI, JIS, DIN, EN, and SAE.
- You want waveform recording with up to 10 stored records and playback.
- You want 3 rolls of thermal paper in the box instead of 2.
❌ Who Should Skip All of These?
If you only ever test one personal car a couple times a year, a full printer-equipped tester is overkill. A basic handheld voltmeter or a simple plug-in battery monitor would cover your needs for far less hassle.
For most auto shops, I’d go with the OBDMATE BT770. Its 4.8-star rating from 39 reviews and solid 12V/24V coverage make it the safer daily driver — only pick the ELMCONFIG BM800 if 6V testing is a must.
Frequently Asked Questions
Which is better for auto shops, the OBDMATE BT770 or the ELMCONFIG Car Battery Tester?
For most auto shops, I’d pick the OBDMATE BT770. It holds a 4.8-star rating from 39 reviews versus the ELMCONFIG’s 3.9 stars from 23, and that gap matters when you’re relying on a tool daily. Both cover 100-2000 CCA and both have a 2.8″ color screen and thermal printer. The BT770’s higher rating and 12V/24V coverage make it the safer bet for a busy bay.
Is the OBDMATE BT770 worth the extra money over the ELMCONFIG BM800?
Yes, in my view. The BT770 costs more, but you’re paying for a 4.8-star track record and a hard carry case in the box. The ELMCONFIG is cheaper and includes 3 rolls of thermal paper, but its 3.9-star rating comes with reports of blank or blurry prints if the roller isn’t pressed tight. If reliability matters, the BT770 earns its price.
Does the ELMCONFIG battery tester support 6V, and does the OBDMATE BT770?
The ELMCONFIG BM800 supports 6V, 12V, and 24V, while the OBDMATE BT770 handles only 12V and 24V. That’s the single biggest difference between them. If you service older vehicles, motorcycles, or 6V equipment, the ELMCONFIG is the one you want. If everything you touch is 12V or 24V, the BT770 covers you fine.
Which tester has better printing, the BT770 or the ELMCONFIG BM800?
Both offer one-tap thermal printing, but there’s a practical difference. The OBDMATE BT770 ships with 2 rolls of paper, while the ELMCONFIG includes 3. However, ELMCONFIG’s own notes warn that you must press the roller tightly against the paper to avoid blank or blurry output. I’d trust the BT770’s printing more given its 4.8-star rating.
Can the OBDMATE BT770 test 24V trucks and the ELMCONFIG test cars?
Yes to both. The OBDMATE BT770 covers 12V and 24V vehicles including trucks, boats, RVs, and ATVs up to 2000 CCA. The ELMCONFIG BM800 fits cars, trucks, and motorcycles across 6V, 12V, and 24V. So the ELMCONFIG is more versatile on voltage, but the BT770 has the stronger reliability record.
Which one is easier to use for a home mechanic?
I’d give the edge to the OBDMATE BT770 for ease of use. Its 2.8″ color screen uses larger fonts and higher resolution than the common 2.4″ panels, and the menus are straightforward with 7 languages. The ELMCONFIG BM800 also has a 2.8″ color screen with waveform playback, but its lower 3.9-star rating suggests more users hit snags. For a beginner, the BT770 is the friendlier pick.
My Final Verdict
After weighing everything, the OBDMATE BT770 is my clear winner for auto shops. Its 4.8-star rating from 39 reviews crushes the ELMCONFIG’s 3.9 stars from 23, and it covers 12V/24V systems up to 2000 CCA with a bigger 2.8″ color screen and a hard carry case included. The ELMCONFIG BM800 is the better pick only if you need its 6V support or its 10 test standards for older vehicles.
If you’re on the fence, ask yourself one question: do you ever test 6V batteries? If not, the BT770’s stronger reliability record is the smarter buy. If 6V work is common in your shop, the ELMCONFIG earns its place instead.
Best Overall: OBDMATE BT770
- 【Battery Tester for 12/24V Batteries】 BT770 Car battery tester works...
- 【One-click Battery Health Reports Printing】 Built-in thermal printer...
- 【Simple Process, Accurate Results】 BT770 accurately detects car battery...
Best for general auto shops testing 12V and 24V batteries. Its 4.8-star rating from 39 reviews and 100-2000 CCA range make it the most dependable daily tool here.
Runner-Up: ELMCONFIG BM800
- Multi-Mode Battery Diagnosis：Professional 6V 12V 24V battery load tester...
- Built-in Thermal Printer：One-key printing generates clear test reports...
- 10 Global Test Standards：Supports CCA, BCI, CA, MCA, JIS, DIN, IEC, EN...
Best for shops that service older vehicles. It’s the only one here with 6V support and it covers 10 test standards, though its 3.9-star rating is the trade-off.
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